Low-permeability reservoir comprehensive geological-engineering classification evaluation method

A technology for low-permeability reservoirs and reservoir geology, applied in the field of comprehensive geological-engineering classification evaluation of low-permeability reservoirs, can solve problems such as the lack of reasonable evaluation methods

Active Publication Date: 2021-03-16
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

At present, there are many studies on the main controlling factors of reservoir fracturing effects, but there is no reasonable evaluation method for how to classify the effects of reservoir fracturing

Method used

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  • Low-permeability reservoir comprehensive geological-engineering classification evaluation method
  • Low-permeability reservoir comprehensive geological-engineering classification evaluation method
  • Low-permeability reservoir comprehensive geological-engineering classification evaluation method

Examples

Experimental program
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Embodiment 1

[0044] This example is based on the low-permeability Wuerhe Formation reservoir in a certain basin in the west. The steps are as follows:

[0045] Step 1: Prepare experimental core data, geological data, fracturing data, geological logging reports, oil testing data, and well logging data;

[0046] Step 2: Determine the perforation fracturing section of a single well according to the fracturing data, determine the oil test section of a single well and the liquid production rate of the oil test section according to the oil test data, and obtain the oil test section according to the single well log data permeability. According to the production split coefficient of single well and multi-layer combined production, the fluid production volume of the fracturing section can be split, and the single well fluid production volume can be divided into each small layer, so as to calculate the production per meter of each single layer. liquid index. Yield split coefficient M i Calculated...

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Abstract

The invention relates to a low-permeability reservoir comprehensive geological-engineering classification evaluation method. The method comprises the steps that reservoir geological classification evaluation indexes are constructed, specifically, a gray correlation method is used for obtaining reservoir geological main control factors, influencing the fracturing effect, of a low-permeability reservoir; based on the reservoir geological main control factors, low-permeability reservoir geological classification evaluation indexes are constructed by using a principal component analysis method; reservoir engineering classification evaluation indexes are constructed, specifically, geomechanical main control factors, influencing the fracturing effect, of the low-permeability reservoir are obtained by using a grey correlation method; based on the geomechanical main control factors, low-permeability reservoir engineering classification evaluation indexes are constructed by using an analytic hierarchy process; and according to the classification threshold values of the reservoir geological classification evaluation indexes and the reservoir engineering classification evaluation indexes, reservoir categories are divided. According to the method, comprehensive evaluation is carried out from two aspects of geology and engineering, the fracturing effect of the low-permeability reservoir canbe prejudged and evaluated more scientifically and reasonably, and a more scientific and accurate basis is provided for fracturing well selection and fracturing construction parameter selection.

Description

technical field [0001] The invention relates to the technical field of production well stimulation and transformation, in particular to a comprehensive geological-engineering classification evaluation method for low-permeability reservoirs. Background technique [0002] During the exploitation of low-permeability reservoirs, fracturing is an important means of increasing production. As an important production stimulation measure, hydraulic fracturing has the characteristics of high risk and high cost. In order to improve the efficiency of reservoir stimulation, it is necessary to reasonably analyze the main controlling factors, predict the fracturing effect in advance, and provide a design basis for the selection of fracturing well selection and fracturing operation parameters, which shows that the evaluation of fracturing effect is particularly important. [0003] There are many factors affecting the fracturing effect, including reservoir geological factors, geomechanical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B43/26G06F30/20
CPCE21B49/00E21B43/26G06F30/20E21B2200/20G01V99/005G06F2113/08G06F30/28G01V99/00
Inventor 熊健黄林林刘诗琼刘向君梁利喜刘红岐
Owner SOUTHWEST PETROLEUM UNIV
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